MultiPath APRS packets decoding
In PLXDigi device we resigned from hardware packet decoding method. MultiPath APRS packet decoding algorithm is a digital signal processing based method utilizing features of modern 32-bit microcontrollers used in our devices.
MultiPath decoding allows to decode received packets simultaneously by two decoding algorithms, with different digital filters applied to both paths. Packets distorted by low-frequency components or with imbalanced 1200/2200Hz tones are prefiltered which increases the probability of correct packet decoding.

APRS client
PLXDigi allows you to generate APRS data packets with information field defined by user and send them in a specified interval. In this way, it is possible to send beacons, objects, weather and telemetry data.

APRS digipeater
The main purpose of the device is receiving and sending APRS data packets via amateur radio transceiver. PLXDigi is capable of receiving an APRS packet, decoding the sender, recipent, path and information field. Then actions are performed in accordance with the options configured by user:
- Packet is digipeated via the APRS network,
- Packet is ignored if it was corrupted.
Device firmware implements the following mechanisms:
- Checksum Verification - packets with errors are ignored,
- Anti-flood - packets repeated in a short time interval are not forwarded,
- Path checking - a decision whether to digipeat a packet or not is made using a filter stored in configuration data of the device. User defines whether to forward WIDE1-1, WIDEn-N, SPn-N, or local path packets and the maximum value of N (so called New-N paradigm),
- Callsign filter - a simple callsign filter allows you to add stations to black list (these stations will be ignored) or white list (only these stations will be digipeated).

WXTelemetry module support (analog channels)
You can get more telemetry report options when using external WXTelemetry module. With WXTelemetry module you can measure and send following values:
- two current measurement inputs,
- two voltage measurement inputs,
- DS18B20 digital thermometer input.

WXBits telemetry module support (digital inputs/outputs)
You can use an additional WXBits module for reporting of digital input channels and administration of output channels. WXBits is a module which includes:
- 4 optocoupler digital inputs,
- 4 mosfet transistor open-collector outputs.
States of both inputs and outputs can be reported in APRS telemetry reports and outputs can also be controlled via serial port console.

Firmware and configuration updates
In PLXDigi you can do all firmware and configuration updates over an USB cable connection from your PC using a simple Configurator application.

Device printed circuit board
Below you can see a photo of a device PCB. It is a compact design mounted on a high-quality 2-layer PCB manufactured in Poland. Every unit is mounted and tested by me.

UPDATE 25.04.2020:Polish Post shipments to most European countries is now restored. If you need anything, do not hesitate to order.UPDATE 06.05.2020:Shipping to more countries is possible, including USA via Polish Post registered priority mail (shipping times may be longer due to coronavirus problem).